| Value | Category | Cases | |
|---|---|---|---|
| -99 | 4 |
1.6%
|
|
| 1 | Every few days | 15 |
5.9%
|
| 2 | Every few weeks | 45 |
17.6%
|
| 3 | Every few months | 96 |
37.5%
|
| 4 | Not at all | 68 |
26.6%
|
| Sysmiss | 28 |
10.9%
|